Dynamic reversible multi-cross section universal modular driveline coupler

ABSTRACT

Apparatus and method for an improved driveline coupler having a reversible saddle thereon which allows it to be configured to work with different sizes and shapes of shafts. The reversible saddle is configured on one side to work with one size of driveline shaft and configured on the opposite side to work with a different size driveline shaft so that in the field, an operator can modify the driveline coupler from use with a first size of drive shaft to a second size of drive shaft easily and quickly by turning the saddle upside down.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates generally to driveline couplers for connecting drive train components, and more particularly, is concerned with a driveline coupler having a reversible saddle for operation with different sizes and shapes of drive shafts.

DESCRIPTION OF THE RELATED ART

Devices relevant to the present invention have been described in the related art; however, none of the related art devices disclose the unique features of the present invention.

In U.S. Pat. No. 8,257,184 dated Sep. 4, 2012, Cordes, et al., disclosed a driveline coupler including an insert member along with a center pin; however, this driveline coupler is not adapted to work with nor does it disclose a reversible saddle. In U.S. Pat. No. 6,755,363 dated Jun. 29, 2004, Weatherl, et al., disclosed a high torque driveline coupler in the nature of a split coupler including a rounded body member for mating into a receptacle of a PUC-like member, however, this driveline coupler was not adapted to work with nor does it disclose a reversible saddle. In U.S. Pat. No. 6,840,862 dated Jan. 11, 2005, Daniel disclosed a universal coupler for agricultural drive systems with an adjustable clamping hub; however, this driveline coupler is not adapted to work with nor does it disclose a reversible saddle. In U.S. Patent Application Publication No. 2001/0025894 dated Oct. 4, 2001, Weatherl, et al., disclosed a high torque driveline coupler in the nature of a split coupler including a rounded body member for mating into a receptacle of a PUC-like member, however, this driveline coupler is not adapted to work with nor does it disclose a reversible saddle. In U.S. Pat. No. 9,022,872 dated May 5, 2015, Daniel disclosed a drive shaft coupling mechanism; however, this drive shaft coupler is not adapted to work with nor does it disclose a reversible saddle. n U.S. Patent Application Publication No. 2004/0121843 dated Jun. 24, 2004, Daniel disclosed a universal coupler for agricultural drive systems with an adjustable clamping hub; however, this coupler is not adapted to work with nor does it disclose a reversible saddle. In U.S. Patent Application Publication No. 2014/0228133 dated Aug. 14, 2014, Daniel, et al., disclosed a drive shaft coupling mechanism; however, this coupler is not adapted to work with nor does it disclose a reversible saddle. In Great Britain. Patent Application No. GB418,541 dated Nov. 25, 1933, Mollart, et al., disclosed an improvement related to universal joints; however, this universal joint is not adapted to work with nor does it disclose a reversible saddle. In China Patent No. CN 201010565789.7A dated Nov. 30, 2010, an unknown inventor disclosed a universal joint; however, it is not adapted to work with nor does it disclose a reversible saddle. Furthermore, none of the related art discloses modularity of the device.

While these devices may be suitable for the purposes for which they were designed, they would not be as suitable for the purposes of the present invention as hereinafter described. As will be shown by way of explanation and drawings, the present invention works in a novel manner and differently from the related art.

SUMMARY OF THE PRESENT INVENTION

The present invention discloses an improved driveline coupler having a reversible saddle thereon which allows the driveline coupler to be configured to work with different sizes and shapes of drive shafts, including square shafts and round shafts. The reversible saddle is configured on one side to work with one size of driveline shaft and configured on the opposite side to work with a different size driveline shaft so that, in the field, an operator can modify the driveline coupler of the present invention from use with a first size of drive shaft to a second size of drive shaft easily and quickly by simply reversing the saddle, i.e., by turning it over. The reversible configuration, as opposed to a one sided design also provides fora wider range of sizes and configurations.

An object of the present invention is to provide a driveline coupler which utilizes a reversible saddle for operation with round and square shafts and other types of shafts. A further object of the present invention is to provide a driveline coupler having a reversible saddle for use with different sizes of square round and triangular shafts (from ¾″ to 1 3/16″) in size while also being compatible with a one inch round shaft. A further object of the present invention is to provide a driveline coupler which utilizes a reversible saddle that can act as the sacrificial component within the driveline coupler if the driveline is overloaded. A further object of the present invention is to provide a driveline coupler which can be more easily used in the field for adaptation to various sizes of drive shafts. A further object of the present invention is to provide a driveline coupler which can be more easily interchangeable with spare parts from other types and brands of driveline couplers. A further object of the present invention is to provide a driveline coupler which can be easily operated by a user. A further object of the present invention is to provide a driveline coupler which can be relatively easily and inexpensively manufactured.

The foregoing and other objects and advantages will appear front the description to follow. In the description reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. These embodiments will be described in sufficient detail to enable those skilled in the art to practice the invention, and it is to be understood that other embodiments may be utilized and that structural changes may be made without departing from the scope of the invention. In the accompanying drawings, like reference characters designate the same or similar parts throughout the several views.

The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is best defined by the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

In order that the invention may be more fully understood, it will now be described, by way of example, with reference to the accompanying drawings in which:

FIG. 1 is a perspective view of the present invention shown in operative connection on a sprinkler irrigation system.

FIG. 2 is a perspective view of a first end of the present invention.

FIG. 3 is a perspective view of a second end of the present invention.

FIG. 4 is a side view of the present invention.

FIG. 5 is a top view of the present invention.

FIG. 6 is a bottom view of the present invention.

FIG. 7 is a right end view of the present invention.

FIG. 8 is a left end view of the present invention.

FIG. 9 is a cross sectional view of the present invention taken from FIG. 5 as indicated.

FIG. 10 is a perspective view of one side of the saddle of the present invention.

FIG. 11 is a perspective of a second side of the saddle of the present invention.

FIG. 12 is a side view of the saddle of the present invention.

FIG. 13 is a top view of the saddle of the present invention.

FIG. 14 is a bottom view of the saddle of the present invention.

FIG. 15 is an end view of the saddle of the present invention.

FIG. 16 is a perspective view of a first end of the second embodiment of the present invention.

FIG. 17 is a perspective view of a second end of the second embodiment of the present invention.

FIG. 18 is a side view of the second embodiment of the present invention.

FIG. 19 is top view of the second embodiment of the present invention.

FIG. 20 is a bottom view of the second embodiment of the present invention.

FIG. 21 is a right end view of the second embodiment of the present invention.

FIG. 22 is a left end view of the second embodiment of the present invention.

FIG. 23 is a cross sectional view of the second embodiment of the present invention taken front FIG. 19 as indicated.

FIG. 24 is a perspective view of a first end of a third embodiment of the present invention.

FIG. 25 is a perspective view of a first end of a third embodiment of the present invention.

FIG. 26 is a perspective view of a second end of the second embodiment of the present invention.

FIG. 27 is a side view of FIG. 2 showing the second embodiment of the present invention.

FIG. 28 is a perspective view of a first end of a fourth embodiment of the present invention.

FIG. 29 is a perspective view of a second end of a fourth embodiment of the present invention.

FIG. 30 is a cross sectional view of a fourth embodiment of the present invention.

FIG. 31 is a perspective view of a first end of the fifth embodiment of the present invention.

FIG. 32 is a perspective view of a second end of the fifth embodiment of the present invention.

FIG. 33 is a side view of the fifth embodiment of the present invention.

FIG. 34 is a bottom view of the fifth embodiment of the present invention.

FIG. 35 is a side view at the fifth embodiment of the present invention.

FIG. 36 is a right end view of the fifth embodiment of the present invention.

FIG. 37 is a left end view of the fifth embodiment of the present invention.

FIG. 38 is a cross sectional view of the fifth embodiment of the present invention taken from FIG. 35 as indicated.

FIG. 39 is a perspective view of a first end of a driveline coupler related to the present invention.

FIG. 40 is a perspective view of a second end of a driveline coupler related to the present invention.

FIG. 41 is a perspective view of a first end of a driveline coupler related to the present invention.

FIG. 42 is a perspective view of a second end of a driveline coupler related to the present invention.

FIG. 43 is a perspective view of a first end of a driveline coupler related to the present invention.

FIG. 44 is a perspective view of a second end of a driveline coupler related to the present invention.

LIST OF REFERENCE NUMERALS

With regard to reference numerals used, the following numbering is used throughout the drawings.

10 present invention

10 a alternate embodiment of present invention

10 b alternate embodiment of present invention

10 c alternate embodiment of present invention

10 d alternate embodiment of present invention

11 a driveline coupler

11 b driveline coupler

11 c driveline coupler

12 sprinkler irrigation system

14 water irrigation conduit

16 water piping and delivery system

18 support tower

20 supporting wheel assemblies

22 drive motor

24 first drive shaft

26 second drive shaft

28 first output shaft

30 second output shaft

32 center sear box

33 leg

34 round load arm

35 retainer bolt

36 nut

37 leg

38 square load arm

39 base portion of load arm

40 reversible saddle

41 integrated saddle

42 bolt

43 nut

44 Polyurethane Coupler (PUC)/insert member

45 central portion

46 first side of reversible saddle

47 arm

48 second side of reversible saddle

49 opening

50 body of driveline coupler

52 PUC centering protrusion (variable size?)

54 receptacle for RUC centering protrusion

56 center pin

57 nut

58 grooves

60 semi-circular cutout

62 aperture

64 recess

66 recess

68 projection

70 angular surface

72 projection

74 angular surface

75 indention

76 recess

78 bolt pad

80 round shaft

82 square shaft

84 spit load arm

86 first split load arm member

88 second split load arm member

90 threaded fastener

92 nut

94 side flange

96 side flange

98 recess

100 recess

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)

The following discussion describes in detail at least one embodiment of the present invention. This discussion should not be construed, however, as limiting the present invention to the particular embodiments described herein since practitioners skilled in the art will recognize numerous other embodiments as well. For a definition of the complete scope of the invention the reader is directed to the appended claims. FIGS. 1 through 44 illustrate the present invention wherein an improved driveline coupler is disclosed and which is generally indicated by reference number 10.

Turning to FIG. 1 , therein is shown the present invention 10 being a driveline coupler which is used as a part of a sprinkler irrigation system 12 which includes a water irrigation conduit 14 which delivers water to a water piping and delivery system 16 for application to, e.g., an agricultural crop which would be disposed underneath the water piping and delivery system. The sprinkler irrigation system 12 is carried by a pair of support towers 18 (in a field operation the system 12 could include several support towers 18, e.g., four) which are transported on a pair of ground contacting supporting wheel assemblies 20 which move the sprinkler irrigation system 12 from one location to another location. The wheel assemblies 20 are powered by a drive motor 22 which is commonly electrically operated and which drives the wheels 20 through first and second drive shafts 24, 26 which are connected to output shafts 28 and 30 of a center gearbox 32 by a first and second driveline coupler 10 designed according to the teachings of the present invention.

Turning to FIGS. 2-9 , therein is shown a first embodiment of the present invention 10 being a driveline coupler. Turning more specifically to FIG. 2 , therein is shown a driveline coupler designed according to the teachings of the present invention 10, having a round load arm 34 on one end which includes a ⅜ inch (bolt size can vary depending on regional availability, such as metric equivalent or substitute) nut 36 with mating retainer bolt 35, and, on the other end a square load arm 38 along with a reversible saddle 40 adaptable for use with round, square ¾″ to 1″, triangular, and octagonal drive shaft cross sections. Saddle 40 is joined together by a bolt 42 with mating ⅜ inch nut 43; and, base portion 39 of the load arms is also shown. (All dimensions provided in this application for component parts such as nuts and bolts are approximate). The reversible saddle 40 and base portion 39 together contain an opening 49 for receiving a shaft so that the saddle 40 is circumferentially contractible about the shaft. The present invention could be called a dynamic reversible multi-cross section universal modular coupler. Other cross sections such as octagonal could also be used with the present invention. Also shown is a Polyurethane Coupler (PUC) or insert member 44 between the two load arms 34,38. The driveline coupler of the present invention 10 provides a universal design which allows it to work with a 1″ (nominal dimension) round shaft along with square shafts sized ¾ inch, ⅞ inch, and sizes up to 1 3/16″. Also, larger sizes such as 1 3/16″ (of about 30 mm) or even larger sizes can also be envisioned for high speed, or continuous move, and/or larger systems or applications requiring more shaft torque load, handling capacity. One skilled in the art would understand that shaft sizes or shapes can be scaled larger or smaller to accommodate other applications. Also, one skilled in the art would understand that the present invention 10 provides a modular platform allowing for multiple shaft configurations, sizes, cross sections, and retrofitable with other compatible load arms and PUCs. The present invention 10 also allows for easy interchange with or retrofitting with other type saddles and other parts from other brands of driveline couplers which might be found in the field. Note that the driveline coupler of the present invention 10 uses no shims, i.e., it is shimless, so that it can be more easily changed from operation with one size of square shaft to a second size of square shaft and also including multiple sizes and cross sections of drive shafts, while maintaining axial or non-axial alignment of the input and output shafts secured on either side of the coupler. Additionally, it is also envisioned that the modularity of the invention would allow the use of two round load arms 34, to be used in conjunction on one side of the drivetrain mounting as shown in FIG. 31 . Turning more specifically to FIG. 3 , therein is shown on one end of the present invention 10 the round load arm 34 with the retainer bolt 35 and mating nut 36. On the other end is shown the square load arm 38, saddle 40, and bolt 42 and mating nut 43. PUC 44 is also shown between the two load arms 34,38. Also shown is opening 49.

A retainer bolt 35 is the preferred bolt to use with the present invention 10 because they have a short portion immediately beneath the head formed into a square section, i.e., a carriage style bolt, which makes the bolt self locking when placed through a square hole in a mating metal piece which allows the nut 36 to be installed with only a single tool working from only one side of bolt 35. Additionally, the coupler is preassembled and utilizes a limited number of larger bolts, making them easier to handle, harder to drop, and easier to find if they are dropped. This makes the job of changing parts of the present invention 10 in the field easier because only one tool is needed to complete the job. The retainer bolt 35 passes through a mating aperture in the shaft so that the shaft is secured and thereby prevented from rotation within the load arm.

The square load arm 38 of the present invention 10, as illustrated in FIGS. 2 and 5 for example, is somewhat elongated to allow for positioning of the drive shaft within the square load arm because in the field the length of the drive shaft cannot be readily modified and thus the driveline coupler must be adaptable to fit on and cooperate with various lengths and types of drive shafts so that it will function correctly under a variety of field conditions. The inside surface of square load arm 38 is also provided with grooves 58 for receiving an edge of a square drive shaft so that the drive shaft is secured inside the load arm.

Turning to FIGS. 10-15 , therein is shown a reversible saddle 40 designed according to the teachings of the present invention 10. FIG. 10 shows one side 46 on top while FIG. 11 shows the opposite side 48 on top. When side 46 of the reversible saddle 40 is oriented inwardly on the driveline coupler of present invention 10 as illustrated in FIG. 2 , it can accept square shafts of a first size and when the reversible saddle 40 is flipped over so that the opposite side 48 is oriented inwardly on the driveline coupler it is sized so as to allow it to accept a second size of square shaft and also including multiple shaft sizes and cross-sections up to 1 3/16″. Simply flipping the saddle 40 over allows it to operate with different sizes of square drive shafts. Side 48 has grooves 58 provided which generally form a recess 64 formed by a pair of opposite, mating projections 68 having mating inwardly disposed angular surfaces 70 thereon which allow it to be adjustably sized to fit a range of sizes of square and triangular shafts. These surfaces may also incorporate scallops, arcs, curvatures, and/or other shape augmentations to better accommodate multiple safe sizes and configurations, as illustrated in FIG. 32 , item 100. Side 46 has a semi-circular cutout area 60 (which reduces the load concentration) provided which generally form a recess 66 formed by a pair of opposite, mating projections 72 having mating inwardly disposed angular surfaces 74 thereon which allow it to be adjustably sized to fit a range of different sizes of square and triangular shafts. Each projection 68, 72 has a small recess 76 provided for allowing room for placement of a nut on a mating bolt passing through aperture 62. A plurality of apertures 62 are provided to receive through bolts to attach the saddle 40 to a driveline coupler of the present invention 10. In order to build a saddle 40 so as to work with any particular size of square shaft, the height/length of and distance between the mating pairs of projections 68, 72 is varied along with the angle of the angular surfaces 70, 74. The areas 78 on either end of saddle 40 are sometimes referred to as bolt pads 78 and the distance between them could also be adjusted for changing the size of the saddle to fit different sizes of drive shafts. FIG. 12 also shows optional indentions or scallops 75 disposed on angular surface 74 of projections 72 (indentions could also be placed on projections 68 at the discretion of a user) wherein the surface is relieved by having part of the surface be cut-away with indentions/scallops so as to better fit to a round shaft.

Turning to FIGS. 16-23 , and more specifically to FIG. 16 , therein is shown a second embodiment 10 a of the present invention including a reversible saddle 40, the bolt 42 having nut 43 thereon along with the body 50 which includes a PUC 44 disposed between the round load arm 34 and the square load arm end 38. Turning to FIG. 23 , embodiment 10 a of the present invention includes a PUC centering protrusion 52 which is a bump-like protrusion, which may be referred to as a ball and socket, mounted on one or both of the load arms 34, 38 of the present invention so that it centers, i.e., aligns, and secures the PUC 44 between the load arms. The protrusions 52 can be varied in size and shape. The PUC centering protrusion 52 is designed to fit into a mating receptacle 54 formed into the PUC 44 and may include an optional center pin 56 with mating nut 57 which may or may not be included in the alternative embodiment 10 a. FIG. 16 also shows the orientation of a ¾″ square shaft 82 within the opening of the square load arm 38 with recess 66 (see FIG. 12 ) of saddle 40 turned away from the opening of the square load arm 38. Other previously disclosed elements may also shown.

Turning to FIGS. 24-25 , therein is shown a third embodiment of the present invention 10 b having a square load arm 38 on each end for receiving drive shafts. It can be seen that a round shaft 80 can be placed in a square load arm 38 so that the angular surfaces 74 of the projections 72 contact the outer surface of the round shaft 80 so as to secure the round shaft within the square load arm. Also shown is a retainer bolt 35 to assist in further securing the round shaft 80 in round load arm 34. A reversible saddle 40 is shown on each end of the present invention 10 b. Other previously disclosed elements are also shown.

Turning to FIGS. 26-27 , therein is shown the second embodiment of the present invention 10 a having a square load arm 38 on one end and a round load arm 34 on the other end and also showing round shaft 80 and square shaft 82 placed within the corresponding load arm. Also shown is a retainer bolt 35 with mating nut 36. One skilled in the art would understand that saddle 40 cooperates with the load arm 34, 38 to completely encircle and secure a drive shaft 80, 82 to the load arm. Also shown in FIG. 26 is square shaft 82 which illustrates the orientation of a ⅞″ square shaft within the opening of the square load arm 38 with the recess 66 of saddle 40 turned toward the opening. Other previously disclosed elements are also shown.

Turning to FIGS. 28-30 , therein is shown a fourth embodiment of the present invention 10 c having a square load arm 38 on one end and a round load long load arm 34 on the other end and including a retainer bolt 35 and mating nut 36 on each load arm. Turning more specifically to FIG. 30 , also shown is a PUC centering protrusion 52 which has been previously disclosed relative to FIG. 23 which aligns and secures the PUC 44 between the load arms. The PUC centering protrusion 52 is designed to fit into a mating receptacle 54 formed into the PUC 44 and may include an optional center pin 56 passing through a mating internal aperture which pin may or may not be included. Other previously disclosed elements are also shown.

Turning to FIGS. 31-38 , and more specifically to FIG. 31-32 , therein is shown a fifth embodiment 10 d of the present invention having a square load arm 38 on one end and a split load arm 84 on the other end. The split load arm 84 has first and second load arm members 86, 88 adapted to be joined together by a plurality, e.g., four, threaded fasteners 90 extending, through apertures in side flanges 94, 96. A recess 98, 100 is provided in each split load arm 84 which is complimentarily sized and shaped to receive a side of the shaft on which the load arm 84 is secured; a retainer bolt 35 with mating nut 36 is also shown. In operation, the first and second load arms 86, 88 are positioned on either side of a shaft with the end of the shaft positioned within the recesses 98, 100 so that the load arm 84 can be clamped tightly to the shaft by the threaded fastener 90. Also shown are the reversible saddle 40 with bolt 42 and nut 43, and, retainer bolt 35 and nut 36 thereon along with the body 50 which includes a PUC 44 disposed between the split load arm end 84 and the square load arm end 38. Other previously disclosed elements may also be shown.

Turning to FIGS. 39-40 , therein is shown a driveline coupler 11 a having a two-piece design including a round load arm 34 and a square load arm 38 having an integrated saddle 41. This driveline coupler 11 a is dissimilar to the preferred embodiment and can only be used on two of four couplers, or on a complete tower driveline, or with an expandable driveshaft. Other previously disclosed elements are also shown.

Turning to FIGS. 41-42 , therein is shown a driveline coupler 11 b having a two-piece design. This design is similar to the design shown in FIGS. 39-40 , however, it includes a retention bolt 35 on the round load arm 34 and on the square load arm 38 of the driveline coupler. Other previously disclosed elements are also shown.

Turning to FIGS. 43-44 , therein is shown a driveline coupler 11 c having a two-piece including a square load arm 38 on each end of the driveline coupler. The square load arm 38 can be used with round or square shafts. Again, this is not the preferred embodiment and can only be used on two of four couplers, on the complete tower driveline, or with an expandable driveshaft. Other previously disclosed elements are also shown.

FIGS. 39 through 44 are including in this application as a contrast to the present invention in order to demonstrate that the present invention uses a smaller number of aluminum components (2), and required load arm configurations (1) versus, e.g., the driveline coupler illustrated in FIGS. 43-44 .

It should be clear that the present invention 10 can be built or configured into various embodiments because the round or square load arms 34, 38 can be combined with various other aspects of the invention including, e.g., the reversible saddle 40, the retainer bolt 35, the PUC centering protrusion 52, the center pin 56, the round shaft 80, or square shaft 82. Many embodiments could be designed by a user without departing from the scope of the invention. For example, some of the configurations follow a through hole could be added onto the square load arm to allow a retainer bolt to pass through for retention of a round drive shaft; using a round load arm or square load arm with one saddle, or, with two saddles; using a split load arm; using a through hole for a retainer bolt for securing round or square shafts; using other drive shaft shapes, e.g., triangular, thereby making the present invention universal and modular; and, extending the modularity to using other types or brands of saddles.

The PUC 44 of the present invention is expected to be made of an elastomeric engineering grade thermoplasitic, such as polyetheurethane, which is a non-hydroscopic material and being uniform in make-up. PUCs 44 may also be made of hydroscopic polyurethane or other similar engineering grade thermoplastic, or rubber. PUCs 44, being made of elastomeric material, serve as a shock absorbing material between the load arms of the present invention particularly on startup of the irrigation system. PUCs 44, along with the load arms 34, 38 and saddle 40, are considered a breakable, or fusible link in the drive train of the present invention.

An advantage of the reversible saddle 40 of the present invention is that no shims are required in order for it to fit onto an up to 1 inch square (or triangular) drive shaft which makes changing shafts in the field much easier. The present invention is also expected to be made of aluminum although any material that would be considered suitable to one skilled in the art could be used. The reversible saddle 40 is designed to permit it to support and be tightened around a shaft as the saddle is generally shaped to fit around the object, i.e., shaft, held therein and is circumferentially contractible around a shaft as it is configured to fit partially around a shaft just as the base 39 is configured to fit partially around the shaft within opening 49.

In summary and by reference to FIGS. 1-44 , as would be understood by one skilled in the art, the present invention 10 discloses a driveline coupler having first and second load arms 34, 38, which have sometimes been referred to as yoke assemblies in the prior art. One of the load arms is expected to be connected to an output shaft 28, 30 from a gearbox 32 or motor 22 and the other load arm would normally be connected to a driveshaft 26, 28 of an irrigation system 12 as illustrated in FIG. 1 . Each of the load arms 34, 38 has an opening 49 and a base portion 39 configured for connection to an output shaft or driveshaft and a pair of legs 33, 37, which have sometimes been referred to as being U-shaped in the prior art, wherein the legs extend away from the base portion so that the legs define a generally U-shaped member configured so that an open side of the U-shaped member faces axially away from the base portion as can be seen in, for example, FIGS. 2, 3, 9, and 23 . The base portion 39 is a bulky area located generally between the end of the load arm where the drive shaft is inserted and the legs 33, 37. The legs are oriented with respect to each other so that they overlap each other being intermeshed; and the load arms may also be joined together by a center pin 56 with mating nut 57. When the driveline coupler of the present invention 10 is attached to a drive shaft, as illustrated in FIG. 1 for example, as would be done in the standard manner by one skilled in the art, the legs 33, 37 overlap each other and cooperate with each other so that when one drive shaft is rotated axially then the other drive shaft is rotated axially in response thereto. A PUC 44, which may have been referred to in the prior art as an insert member or shock absorber, is disposed between the overlapping legs of the first and second load arms 34, 38 for operation as disclosed elsewhere in this patent application wherein the PUC has a central portion 45 and a plurality of arms 47, e.g., four, extending radially from the center portion. 

I claim:
 1. A method for assembling a driveline coupler for a sprinkler irrigation system, comprising the steps of: a) providing a first load arm on a first end of the driveline coupler for connection to a first shaft; b) providing a second load arm on a second end of the driveline coupler for connection to a second shaft; c) mounting a reversible saddle on a portion of at least one of either the first or second load arm; d) providing an upper side and a lower side on the reversible saddle, wherein the upper side is sized for a first size of either the first or second shaft and the lower side is sized for a second size of either the first or second shaft; and e) turning the reversible saddle upside down so that it can be used with different sizes and shapes of drive shafts.
 2. The method of claim 1, wherein either the first or second shaft is selected from the group consisting of a round shaft, a rectangular shaft, a triangular shaft, and a octagonal shaft.
 3. The method of claim 1, wherein the reversible saddle has a hole therein capable of receiving a retainer bolt.
 4. The method of claim 3, further comprising a step of providing a retainer bolt disposed in the hole.
 5. The method of claim 1, further comprising a step of providing a center pin disposed in at least one of either the first or second load arm.
 6. The method of claim 1, further comprising a step of providing a PUC disposed between the first and second load arms, the PUC being made of material designed to absorb shock between the first and second load arms during startup of the sprinkler irrigation system.
 7. The method of claim 6, further comprising a step of providing a centering protrusion mounted on at least one of the first and second load arms.
 8. The method of claim 1, wherein the driveline coupling is shimless to permit the driveline coupler to be more easily configured to accommodate drive shafts of differing shapes and sizes while maintaining axial alignment of the first and second shafts.
 9. The method of claim 1, wherein the reversible saddle further comprises a pair of projections each having an angular surface thereon to accommodate drive shafts of differing shapes and sizes.
 10. The method of claim 1, wherein the driveline coupler is modular to permit it to accommodate multiple configurations of the first and second load arms. 